(n1 {Person} [name: "Alice", age: 23 ])
(n2 {Person, Student} [ name: "Bob" ])
(n3 {Course} [ name: "Algebra" ])
(n1) - (e1 {knows} [since: 2020 ]) -> (n2)
(n2) - (e2 {knows} [start: 2024, end: 2025 ]) -> (n3)